2

Positional change.:
The veins in the face just as the veins in the rest of the body change in size depending on changes in position as well as changes in levels of hydration and changes in pressure in the chest and abdominal cavity. In the face, the veins decrease with standing and increase with lying down. Straining or laughing increase the the pressure in the chest which can increase the size of the facial veins.
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3

Likely:
Squeezing zits (acne) can inadvertently force lipid and bacteria (contained in the pimple) deeper into the skin and subcutaneous fat. That may spread the infection and result in a deeper, more painful problem. It is better to spot treat the pimple with a product specially formulated to treat acne.
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5

Needs evaluation:
Vein should not hurt. If you have a bulging vein and it is tender, then this is suggestive of superficial phlebitis. You should see a vein specialist for an evaluation. Warm compresses and Ibuprofen may help but this should be evaluated.
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6

No worries:
The appearance of a vein on the forehead is usually nothing to be concerned about. In other words the vein has always been there its just visible now. No other symptoms ; no worries.
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7

Positional change.:
The veins in the face just as the veins in the rest of the body change in size depending on changes in position as well as changes in levels of hydration and changes in pressure in the chest and abdominal cavity. In the face, the veins decrease with standing and increase with lying down. Straining or laughing increase the the pressure in the chest which can increase the size of the facial veins.
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8

Congenital:
You were born that way, and often times there are relatives with the same type of vein prominence. The manifestation is made more prominent with straining, talking, singing, yelling---anything that will result in a valsalva maneuver, which is basically holding one's breath and straining down.
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9

Positional change.:
The veins in the face just as the veins in the rest of the body change in size depending on changes in position as well as changes in levels of hydration and changes in pressure in the chest and abdominal cavity. In the face, the veins decrease with standing and increase with lying down. Straining or laughing increase the the pressure in the chest which can increase the size of the facial veins.
...Read more

10

Positional change.:
The veins in the face just as the veins in the rest of the body change in size depending on changes in position as well as changes in levels of hydration and changes in pressure in the chest and abdominal cavity. In the face, the veins decrease with standing and increase with lying down. Straining or laughing increase the the pressure in the chest which can increase the size of the facial veins.
...Read more